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I've used KG12 and wasn't impressed at all. I've got a 3/4 full bottle in my cabinet right now and I doubt I'll ever touch it again, unless it's to get rid of it. The best I've used so far is Montana Extreme 50BMG. It's very strong, though, so you need to use it in a well ventilated area and don't dare make the mistake of putting your nose over a bottle and inhaling. BTDT. Wipeout is another very good product, but it is designed to work slower. An overnight application is best.
Just as a reference, I've used the following copper solvents:
Montana Extreme 50BMG
Wipeout
KG12
Barnes CR-10
Sweets 7.62
Butches Bore Shine
Hoppes Benchrest
Extreme Coppermelt
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